平常经常会求一段时间内的每一天统计数据,或者每一时点的统计数据.但是mysql本身是没有直接获取时点列表的函数或表.下面是自己用到的一些方法,利用临时变量和一个已存在的比较多数据(这个需要根据实际情况决定)的表做关联得到时点列表.希望对大家有所帮助. sql中用到的一些关键数据 #t_table表是系统上已存在的一个有比较多数据的表 一个月的每一天 #2017年7月份的每一天 SET @beginDate='2017-07-01'; SET @maxDate ='2017-07-31'; DAY
Count the Colors Time Limit: 2 Seconds Memory Limit: 65536 KB Painting some colored segments on a line, some previously painted segments may be covered by some the subsequent ones. Your task is counting the segments of different colors you can s
In order to encourage Hiqivenfin to study math, his mother gave him a sweet candy when the day of the month was a prime number. Hiqivenfin was happy with that. But several days later, his mother modified the rule so that he could get a candy only whe
http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=1610 https://vjudge.net/contest/318019#problem/F Painting some colored segments on a line, some previously painted segments may be covered by some the subsequent ones. Your task is counting